don't pass outline colors to _shaped_scatter() as RGBA arrays (#1006)

Co-authored-by: Sonja Stockhaus <stockhaus@cip.ifi.lmu.de>

Author: Sonja-Stockhaus

src/squidpy/pl/_spatial_utils.py

@@ -497,7 +497,7 @@ def _shaped_scatter(
     x: NDArrayA,
     y: NDArrayA,
     s: float,
-    c: NDArrayA,
+    c: NDArrayA | str,
     shape: _AvailShapes | ScatterShape | None = ScatterShape.CIRCLE,
     norm: _Normalize | None = None,
     **kwargs: Any,
@@ -955,7 +955,7 @@ def _plot_scatter(
             coords[:, 0],
             coords[:, 1],
             s=outline_params.bg_size,
-            c=colors.to_rgba_array(outline_params.bg_color),
+            c=outline_params.bg_color,
             rasterized=sc_settings._vector_friendly,
             cmap=cmap_params.cmap,
             norm=norm,
@@ -966,7 +966,7 @@ def _plot_scatter(
             coords[:, 0],
             coords[:, 1],
             s=outline_params.gap_size,
-            c=colors.to_rgba_array(outline_params.gap_color),
+            c=outline_params.gap_color,
             rasterized=sc_settings._vector_friendly,
             cmap=cmap_params.cmap,
             norm=norm,